Gasolene-motor



1. E. LEHMAN.

GASOLENE MOOR.

APPLICATION msn MAR. 19. |918.

Patented Mar. 2,1920.

Aria/Wye x UNITED sTATEs PATENT oEEroE..

JAY E. LEHMAN, OF CANTON, OHIO.

GASOLENE-MOTOR.

Application filed `March 19, 1918.

To all 'to from t may concern Be it known that I, JAY E. LEHMAN, a citizen of the United States, residing at Canton, in the county of Stark and State of Ohio, have invented a new and useful Gras olene-Motor, of which the following is a specification.

rlhis invention relates to gasolene motors of the four cycle type and more especially to valve construction for the same, the object being to construct a valve designed to slidably cover and uncover the cylinder ports.

Another object is to construct a gasolene motor of a sliding valve type in which both the intake and exhaust passages to each cylinder are controlled by one valve.

A further object is to construct a valve on the sliding principle, thereby doing away with the valve scat necessary in the puppet type of valve thus eliminating the carboncollecting valve seat and other objections of the puppet valve. y

llVith these objects in view the invention consists in the novel construction and arrangement of parts, hereinafter described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size and minor details of construction may be made within the scope of the appended claims, without departing from the spirit or sacrificing any of the advantages of the inve tion.

In the drawings:

Figure 1 is a cross sectional view through a gasolene motor constructed in accordance with my invention, the timing gears and drive chain therefor being shown in elevation and partly broken away.

Fig. 2 is a detail plan view on a slightly enlarged scale of a pair of the valve 0perating cams for one cylinder, the valve push rod being shown in section.

Fig. 3 is a side elevation of a pair of cams for one valve, the cam shaft being shown in section and showing a portion of the valve push rod.

Similar numerals of reference indicate corresponding parts throughout the several figures of the drawing.

1 indicates the cylinder, 2 the piston, i the connecting rod and 5 the crank shaft of a gasolene motor, all of ordinary construction used in this class of engines. A

Patented Mar. 2, 1920.

Serial No. 223,429.

port 6 forms a passage from the interior of the cylinder 1 to the valve chamber 7. An inlet port S from the carbureter and an eX- haust port 9 also open into the valve chamloer 7. `The valve,1 chamber is cylindrical and fitting within this chamber is a cylindrical valve 10 having a reduced portion 11,

the purpose of which will be hereinafter specified. A cani shaft 12 is mounten in direct alinement below the valve chamber 7 and carries a timing gear 1%. A chain 15 operating over this gear is driven by a gear 16 mounted on the crank shaft, the gear 1t being provided with precisely twice the number of teeth as the gear 16, thus the crank shaft 5will make two revolutions: to each revolution of the cam shaft 12.

Formed uponthe cam shaft 12 is a pair of cams 17 and 18 for each cylinder of the motor, these cams being positioned upon either side of the push rod 19 of the valve 10. A 4pin 20 secured through the lower end of the push rod 1.9 extends above the cams 17 and 18 as shown and carries antifriction rollers 21 and 22, which rest upon the bifurcated ends of a pivoted arm 2a, which bifurcated ends are interposed between the rollers 21 and 22 and their respective cams 17 and 18. A coil spring' 25 which encircles the push rod 19 is interposed between a pin 26 inserted through the push rod and the bearing`27 formed in the valve chamber and exerts a. constant downward force thus holding the rollers 21 and 22 in constant contact with the bifurcated portion 0f the arm 24@ and said 'bifurcated portions in constant contact with the cams 17 and 18.

In the drawings the piston 2 is shown in the position whichit would assume at the instant the gas is ignited to cause the explosion. Thevalve l() is now positioned by the cams to close the passage 6 and the ports 8 and 9. We will assume that the charge of compressed gas within the cylinder 1 is now ignited causing the explosion and forcing the piston downward. 1When the piston reaches the limit of its downward movement on the firing stroke the crank shaft will naturally have made one-half of a revolution and since the timing gear 16 has precisely half the number of teeth of the gear 14:, the cam shaft 12 will have made exactly one-quarter of a revolution.

In Fig. 3 the cams are shown in the position whichthey would assume when the valve is in the position shown in Fig. 1, or

firing stroke will obviously cause the cani shaft to berotated one-quarter of a revolution and bring the point marked A7 on the cam to position beneath the pin 20 and its v rollers. The cams are concentric from the point directly beneath the pin `20 in Fig. 3 to the point A, thus the valve will remain in the position shown in Fig. l, holding all ports closed during the firing stroke. When the piston begins its upward travel on the scavenging stroke the point A on the cams immediately passes beyond the ends of the bifurcations of the arm 2li and allows the said arms 'tobe forced ldown under the tension ofthe spring 25, yuntil itcontacts with the reduced portions of the cams beginning at the point B. This obviously permits the valve lOvto drop, exposing the exhaust port 9 and the passage 6 but holdingthe intake port 8 closed. The bifurcations 0f the arm Qatraveling from the point B tothe point Cduring the quarter revolution of the crank shaft during the scavenging stroke will allow the exhaust port 9 to remain open. Reaching the limit of its upward movement on the scavenging strokethe piston is now ready to descend on the suction stroke and the cams have been rotated to now bring the point D into contact with the arm 24, forcing the push rod `upward closing the port 9 and opening the portS and passage 6, the portion of the cam between the points D and E holding the intake port thus opened during the'suction stroke of the piston. `When the piston begins itsupward movement on the compression stroke the concentric portion of the cams beginningwith the point E will1 once more have come beneath the rollers 21 and 22,1thus positioning the valve l0 to close all* of the ports.

- Having fully described my invention what I claim as new and desireto secureby Letters Patent, is:

1. A gasolene motor of the class described havinga valve chamber adjacent each cylinder, alsliding valve within each o-f said valve chambers, ajpush rod connected to each-.of said valves, a cam shaft rotatably mounted` in vertical alinement beneath said push rods, a cam formed upon said cam shaft adjacent either side of the lower extremity of each push rod, a bifurcated arm pivoted in horizontal alinement with said cams, one of the bifurcations of said arm lying upon each of the said cams, a roller mounted upon either side of said push rod and above said cams and said bifurcations and a spring operatively engaging said push rod to force the said rollers into constant engagement with the said vbifurcations and lto hold the said bifurcations in constant engagement with the said cams.

2. i/ Xgasolene motor of the character described having a valve chamber located adjacent each cylinder, a piston located within .each kof said cylinders, a 'sliding `valve within each of said val-ve chambers, a communicating passage between each of said cylinders and its adjacent valve chamber, an intake port and an exhaust port entering each of said valve chambers, a push rod extending downwardly 4from each of said valves, a vcam shaft rotatably mounted in Vertical'alinement beneath said push rods, a pair of cams arranged upon said cam shaft adjacent the lower end of each of said push rods, rollers carried upon said push rods and Vabove said cams, a bifurcated arm pivoted adjacent said cam shaft, the said bifurcations lying upon said cams and beneath said rollers, a coil spring operatively engaging each of said push rodsto hold said rollers yin constant engagement with said bifurcationsand to hold said bifurcations in constant engagement with said cams and means for rotating the said cam shaft to position the said sliding valve to simultaneously open the intake port and communieating passage and'to closethe exhaust port when the-said pistondescends on its suction stroke and to 'simultaneously ,open the ex- 

